New treatment at source approach using combination of microfiltration and nanofiltration for dyeing effluents reuse

Abstract

Textile effluents are considered among the most polluted wastewaters all over the world. Among different textile processes, dyeing is the operation that produces the most important amounts of chemical pollution. Many studies have been carried out toward the treatment of these hazardous effluents, and a variety of techniques have been applied for this aim. In this work, the effluents coming from different steps of the dyeing cycle were treated following different mixtures of baths using membrane technology. Nanofiltration (NF) experiments were performed for color removal, but membrane fouling still a major limitation. To enhance NF performances, microfiltration (MF) was carried out as pretreatment to NF. The results showed almost above 99 % of color and turbidity removal and also an important decrease in COD, chloride and salts contents with an improvement in the MF and NF stabilized fluxes of different mixtures compared to that corresponding to the dyeing effluent treated separately. In order to accomplish a full reuse cycle, dyeing experiments were performed using the combined system (MF/NF) permeates. Results were evaluated regarding total color difference between samples and a standard test done with fresh water.

Development of porous alumina membranes for treatment of textile effluent

“…These types of membranes are generally not suitable for wastewater reuse, as the membrane pore size is too large to reject small dye molecules [13]. However, this problem can be solved using by a proper pretreatment technique that allow high removal efficiencies without the high fouling resistance and low permeates flux of the more expensive ultrafiltration (UF) membranes [14].…”

Cleaning ceramic membranes used in treating desizing wastewater with a complex-surfactant SDBS-assisted method

“…Textile effluents are considered as one of the most polluting wastewater in the world and have traditionally been of great interest for wastewater treatment research due to their high volume and inherent complexity [1][2][3]. A typical bleaching and dyeing process consists of desizing, scouring, bleaching, mercerizing, dyeing, printing, finishing and drying operation [4][5][6].…”

Sequential fractionation of value-added coconut products using membrane processes

“…The advantages of membrane filtration technique including low labor cost, low maintenance cost, less space consuming, energy saving, feasible to scale up, no chemicals used, no heat treatment, able to prolong the shelf-life of product, can retain the natural flavor and aroma of raw materials [16,17]. Due to the numerous advantages possessed by membrane filtration, it is used widely from resource recovery to wastewater treatment [18][19][20][21]. Therefore, the membrane separation technique is proposed in this study as one of the most probable ways to fractionate the skimmed coconut milk to produce those value-added products.…”